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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Sun May 23, 2010 5:20 pm Post subject: "Burping" The Oil System in the 912 Engine |
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Am I correct in my understanding that the only reason Rotax states on page 10-15 of the Operators Manual to rotate the prop several times in the direction of engine rotation until one hears the "burp" or "murmur" in the oil tank is to return oil to the tank to check for the proper level in the tank? Some have inferred that you must do this every time before starting the engine to assure proper lubrication through out the engine. My interpretation of the Rotax instructions on page 10-15 of their Operation Manual is that this is to assure that you have the correct oil level in the tank, and for no other reason.
Hugh McKay
Allegro 2000
Rotax 912 UL
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sun May 23, 2010 6:45 pm Post subject: "Burping" The Oil System in the 912 Engine |
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The 912 REQUIRES crankcase pressure to push oil back to the tank. It's a dry sump system with no scavenge pump to empty out the crankcase. When you listen for the burp you're verifying that the engine is sealed so that there are no leaks to keep this from working.
Rick Girard
On Sun, May 23, 2010 at 8:15 PM, Hugh McKay <hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)> wrote:
[quote] Am I correct in my understanding that the only reason Rotax states on page 10-15 of the Operators Manual to rotate the prop several times in the direction of engine rotation until one hears the "burp" or "murmur" in the oil tank is to return oil to the tank to check for the proper level in the tank? Some have inferred that you must do this every time before starting the engine to assure proper lubrication through out the engine. My interpretation of the Rotax instructions on page 10-15 of their Operation Manual is that this is to assure that you have the correct oil level in the tank, and for no other reason.
Hugh McKay
Allegro 2000
Rotax 912 UL
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cscsail(at)gmavt.net
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| Posted: Mon May 24, 2010 1:34 am Post subject: "Burping" The Oil System in the 912 Engine |
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That's how I understand it --- proper level in the tank.
Gordon
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KeysFox
Joined: 05 Jan 2009
Posts: 137
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| Posted: Tue May 25, 2010 12:57 pm Post subject: "Burping" The Oil System in the 912 Engine |
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Rotating the prop ONLY in the normal operating direction May be advised in
order to 1. fill oil tank to check oil level properly, 2. prevent pushing
air into oil delivery passages due to turning prop backwards, and 3.
prevent air from being sucked into oil passages because header tank is
empty and suction tube might draw air instead of oil. At least these are
the explanations I recall from the Lockwood maint course.
BJ
N154K
| Quote: | Am I correct in my understanding that the only reason Rotax states on page
10-15 of the Operators Manual to rotate the prop several times in the
direction of engine rotation until one hears the "burp" or "murmur" in the
oil tank is to return oil to the tank to check for the proper level in the
tank? Some have inferred that you must do this every time before starting
the engine to assure proper lubrication through out the engine. My
interpretation of the Rotax instructions on page 10-15 of their Operation
Manual is that this is to assure that you have the correct oil level in
the tank, and for no other reason.
Hugh McKay
Allegro 2000
Rotax 912 UL
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http://www.matronics.com/Navigator?RotaxEngines-List |
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N154K
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